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Derivation of auditory filter shapes from notched-noise data
1Department of Experimental Psychology, University of Cambridge, U.K.
Hearing Research
|August 1, 1990
Summary
This study refines auditory filter shape estimation by improving the notched-noise method. Modifications enhance accuracy, especially for asymmetric filters and hearing-impaired individuals.
Area of Science:
- Auditory perception
- Psychoacoustics
- Signal processing
Background:
- Auditory filter shape estimation is crucial for understanding hearing.
- Previous methods relied on simplifying assumptions.
- Asymmetry in auditory filters requires careful measurement.
Purpose of the Study:
- To develop a more accurate method for deriving auditory filter shapes.
- To address limitations in previous fitting procedures.
- To improve the analysis of auditory filter asymmetry.
Main Methods:
- Modified the fitting procedure for notched-noise threshold measurements.
- Incorporated corrections for off-frequency listening, earphone response, and outer/middle ear transmission.
- Introduced a limit on filter center frequency shifts to maximize signal-to-masker ratio.
Main Results:
- The refined method provides more accurate auditory filter shapes.
- Significant differences in derived filter shapes were observed at high/low frequencies and in hearing-impaired subjects.
- Ignoring filter asymmetry can lead to serious errors in filter shape derivation.
Conclusions:
- The modified procedure offers a substantial improvement for auditory filter shape analysis.
- New formulae are proposed for auditory filter variations with frequency and level.
- Results impact the calculation of excitation patterns, with a modified procedure suggested.